EP0228491A1 - Spielschläger mit automatisch veränderlicher Balance - Google Patents

Spielschläger mit automatisch veränderlicher Balance Download PDF

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Publication number
EP0228491A1
EP0228491A1 EP85402378A EP85402378A EP0228491A1 EP 0228491 A1 EP0228491 A1 EP 0228491A1 EP 85402378 A EP85402378 A EP 85402378A EP 85402378 A EP85402378 A EP 85402378A EP 0228491 A1 EP0228491 A1 EP 0228491A1
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EP
European Patent Office
Prior art keywords
grip
movable element
stop means
aforementioned
elastic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85402378A
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English (en)
French (fr)
Inventor
Jean Ferdinand André Hufenus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to FR8408836A priority Critical patent/FR2565500B1/fr
Application filed by Individual filed Critical Individual
Priority to EP85402378A priority patent/EP0228491A1/de
Publication of EP0228491A1 publication Critical patent/EP0228491A1/de
Withdrawn legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/02—Ballast means for adjusting the centre of mass
    • A63B60/04—Movable ballast means

Definitions

  • the present invention relates to a variable balance game racket, in particular a tennis racket whose center of gravity, moved towards the head of the racket before service or smash using a mobile element, is automatically brought back towards the "grip" after one of these two movements.
  • a device comprising a movable element which can slide along a profiled guide element disposed between the base of the racket frame and the end of the handle or "grip" serving to hold the racket; the movable element and the guide element comprising means which allow the fixing and the release of the movable element in suitable locations of the guide element.
  • the object of the present invention is to remedy this drawback by the fact that, under the effect of the service or the smash, the mobile element, which has been immobilized beforehand at the base of the frame, automatically revers to the grip where it is maintained in a position fitted for this purpose.
  • the invention essentially relates to a variable balance tennis racket provided with a device comprising a movable element (7) which can slide along a guide element (4) between the base of the frame (3) and a location grip (I), and stop means located on the movable element (7) cooperating with stop means located on the guide element (4); tennis racket in which the movable element (7) is connected to the grip by an elastic element (8a, 8b), the stopping means cooperate in such a way that if the movable element - (7) is first immobilized in a location close to the base of the frame (3) before the service or smash movement is made, the aforementioned movable element is then automatically released and moved towards the frame by the centrifugal force to which it is subjected during service or smash, then brought back by the return effect of the aforementioned elastic element to a location closer to the grip.
  • the movable element (7) is connected by the elastic element (8a, 8b) preferably at the end - (9a, 9b) of the grip furthest from the base of the frame (3) and can slide along the guide element (4) from the grip to the base of the frame, under the effect of a translation thrust (fl) while being subjected to an increasing elastic tension.
  • the guide element (4) is a profile having a flat surface (4a) parallel to the plane of the screen (3a) which comprises, at a short distance "d" from its end fixed to the base of the frame (3) , a stop means (10) capable of cooperating with a stop means (II) of the movable element (7), and the elastic element (8a, 8b) fixed to the movable element passes through a part hollow - (15b) of the grip through holes (8c, 8d) of the front wall (15) of the grip.
  • the racket shown in Figure 1 has the axially hollow grip (l), the arms - (2a, 2b), the frame (3), the screen (3a), the guide element (4), a surface (4a ) of the guide element parallel to the plane of the screen, a means of fixing (5) of the guide element (4) in the vicinity of the grip through the branches (2a, 2b), one end (5a) screwable or snap-on of the fixing means (5), a fastening means (6) of the guide element (4) through the base of the frame, the screwable or snap-on end (6a) of the above-mentioned means (6), mobile element (7), part of the elastic means (8a) fixed on the one hand to the mobile element (7) and on the other hand to the grip by the fixing means (9a), the stop means (10 ) from the surface (4a) of the guide element in the vicinity of the base of the frame, the stop means (II) of the movable element capable of cooperating with the aforementioned stop means (10), the means (12a, 12b) of the mobile
  • the exploded view shown in Figure 2 includes the grip (1), the front wall (15) of the grip facing the frame, the branch (2a), the guide element (4) of rectangular section on which can slide the mobile element (7) which is attached to the grip by the elastic element (8b) fixed on the one hand to the movable element at (14b) and on the other hand to the grip at a location (9b) not drawn.
  • the surface (4a) of the guide element parallel to the plane of the screen, comprises a stop means in the form of a lug (10) whose surface (10b) facing the screen is perpendicular to the surface ( 4a) above and the surface (10a) facing the movable member is an extension of the surface (4a) according to an inclined curve; the aforesaid lug having a height "h" relative to the surface (4a) and the surface (10a) being at a distance "d" from the end of the guide element fixed to the frame.
  • the mobile element (7) comprises a spring system (11c) housed in the opening (7a), fixed around the axis (Ild), and terminated by a stop means in the form of a lug ( II) turned towards the guide element.
  • the surface (Ilb) of the aforementioned lug is turned towards the grip perpendicular to the surface (4a) of the guide element and the surface - (Ila) turned towards the sieve forms the inclined part of the lug (II) .
  • the arrow (fl) indicates the direction of the translational thrust exerted on the movable element to move it towards the frame and the arrow (f2) the pressure exerted on the spring system (11c) housed in the opening (7a) so that the surface (Ilb) of the lug (II) can be brought into contact with the surface (10b) of the lug (10) when the lug (II) has passed towards the frame the opposing lug ( 10).
  • the surface (Ilb) is then held against the surface (10b) under the effect of the tension of the elastic means (8a, 8b) whose part (8a) symmetrical with the part (8b) is not shown in the drawing .
  • the movable element (7) has rigid projections (12a, 12b), and the branches (2a, 2b) of flexible means (13a, 13b) close to the grip but allowing the aforementioned protrusions to pass by bending when the movable element ( 7) is brought back to the base of the grip after the service or the smash.
  • the aforementioned flexible means then exert a sufficient retaining force against the aforementioned projections to maintain the movable element in the vicinity of the front wall - (15) of the grip during exchanges according to the service or the smash.
  • the orifice (5c) through which the fixing means (5) passes is indicated on the branch (2a).
  • the device represented in FIG. 3 comprises the grip (I), the guide element (4) penetrating through the front wall (15) of the grip turned towards the screen in the axial part (15b) of the grip which is hollow on its entire length up to the closing element (15a), the surface (4a) of the guide element, the orifice (5b) of the guide element through which the fixing means (5) passes , the aforementioned fixing means (6) and its end (6a), the movable element (7), the elastic means (8a, 8b) the fixing means (9a, 9b) to the grip and (14a, 14b) to the mobile element, the lug (10) of the guide element and its surfaces (10a) and (10b) above as well as the opposing lug (II) of the mobile element with its surfaces (Ila) and (Ilb ) terminating the spring system (11c) fixed to the movable element around the axis (Ild), and the indication of the height "h” and the distance "d” above.
  • the lug (II) of the movable element (7) has a first position according to which it is at a distance greater than "h" from the surface (4a) of the guide element - ( 4), and a second position according to which it is at a distance less than "h” from the surface (4a) of the guide element (4); the passage from the first to the second position being effected by a pressure (f2) exerted on the spring (llc) integral with the lug (II), and conversely the passage from the second to the first position being due to an effect antagonist of the spring (Ilc) just sufficient to return the lug (II) to its first position, when the aforementioned pressure is removed.
  • the movable element (7) is released so that, on the one hand, the above-mentioned elastic tension, while being sufficient to hold the movable element against the guide element before service or smash, is sufficient lower than the centrifugal force to which the moving element (7) is subjected due to the speed imparted to the racket during service or smash, and that on the other hand the above-mentioned distance "d" is sufficient to allow successively the release of the movable element (7) under the effect of the aforementioned centrifugal force then its return to a location closer to the grip.
  • the movable element In the starting position, that is to say before the racket is armed for service or smash, the movable element is in the location close to the grip, the projections (12a, 12b) being between the flexible means ( 13a, 13b) and the front wall (15) of the grip.
  • the player exerts a translational thrust on the movable element along the guide element towards the frame while also exerting pressure on the spring (llc) at the end of the stroke when the lug (II) of the movable element exceeds the position of the lug (10) of the guide element.
  • the player can then stop the translational movement while maintaining the pressure according to (f2), so that the mobile element is subjected to tension of the elastic element and the surface - (Ilb) comes to be pressed against the surface ( 10b), which has the effect of immobilizing the movable element.
  • the player can also combine the pressure (f2) with the thrust (fl) so that at the end of the stroke of the movable element the surface (Ila) comes to rub against the surface (10a), before the 'pin (11) snaps onto pin (10).
  • the device of FIG. 4 comprises the means for stopping the guide element (4) constituted at the end of the surface - (4a) by a notch (16) successively comprising a flat part (16b) forming towards the frame with the screen plane (3a) an angle not exceeding 90 ° and located at the distance "d" from the end of the guide element, a surface (4b) below the surface (4a) and parallel to it, an inclined part (16a) forming towards the grip with the surface - (4a) an obtuse angle, and a surface (4c) above the surface (4a) and parallel to it, the stop means (II) of the movable element having the shape of a lug directed towards the guide element and the part (Ilb) turned towards the grip can cooperate with the part (16b) mentioned above, the the aforementioned lug being connected to the movable element (7) by the spring
  • the mobile element is released by the fact that on the one hand the above-mentioned elastic tension is sufficiently lower than the centrifugal force to which the mobile element (7) is subjected due to the speed imparted to the racket during the service or smash, and that on the other hand the distance "d" above is sufficient taking into account the spring (llc) and the configuration of the surfaces - (4b, 16a, 4c) of the notch (16) to allow disengagement of the movable element (7) under the effect of centrifugal force and its return to a location closer to the grip under the effect of the tension of the above-mentioned elastic means.
  • the racket is subjected to an increasing centrifugal force, in particular the mobile element which, when this centrifugal force is greater than the tension force of the elastic element (8a, 8b), moves towards the frame by releasing the 'pin (II) whose surface (Ilb) is no longer held against the surface (16b) of the notch (16).
  • the tension of the elastic element is adjusted so that, under the effect of increasing centrifugal force, the lug (II) of the movable element moves successively against the surfaces - (4b, 16a, 4c) in the direction of the frame (3) over such a distance from the surface (4c) that, when the centrifugal force decreases at the end of the service, the return speed imparted to the movable element is sufficient, taking into account the effect of spring (Ilc), the difference in level between the surfaces (4c) and (4a), and the distance separating the surface (4c) and the surface (4a), so that the lug (11) is no longer retained by the notch (16); the movable element then being brought back towards the grip as indicated in the case of FIG. 3.
  • any system producing the same immobilization then release result as that obtained with the lug (II) and the notch (16) according to FIG. 4, can be used in the racket of the invention.
  • FIG. 5 indicates the sections of the branches (2a, 2b), of the guide element (4) and of the orifice - (4d) through which the aforementioned element crosses the wall - (15) of the grip, the sections elastic means (8a, 8b) and respective orifices (8c, 8d) through which the aforementioned means pass through the aforementioned wall (15).
  • the invention relates to a racket with variable equilibrium comprising an automatic release system for the movable element previously immobilized in a location close to the base of the frame on the guide element, said system being based on the fact that, during service or smash, the centrifugal force imparted to the mobile element increases until reaching, at the time of impact with the ball, a value such as the means of stopping the moving element no longer work; the centrifugal force then decreasing until the end of the service or smash movement so that the mobile element is brought back towards the grip by an elastic element whose tension opposes the centrifugal force.
  • FIGS. 2 to 5 The preferred devices of the invention are illustrated in detail in FIGS. 2 to 5, but any other system, immobilizing the mobile element before the service or the smash and then releasing it at the time of impact so that it is brought back towards the grip by an elastic element can be used according to the invention.
  • the movable element and the guide element are known from the prior art, in particular by French patents No. 2235714 and 2270907.
  • the movable element of the invention further comprises, fixed on the axis (Ild) the spring (llc) terminated by the lug (II) which can move in the slot (7a) perpendicular to the guide element, the fixing means (14a, 14b) for the elastic element - (8a, 8b) and the projections (12a, 12b).
  • Any other spring system than the blade (Ilc) and the axis (Ild) can be used according to the invention.
  • the aforementioned leaf spring may in particular be made of steel or any other elastic material, and the elastic system may be a composite system comprising rigid elements and elastic elements.
  • the fixing means (14a, 14b) can be constituted by hooks or any other equivalent means.
  • the rigid projections (12a, 12b) can be located at any point of the movable element provided that they cooperate with the flexible means (13a, 13b) of the branches - (2a, 2b) as shown in Figures 1 and 2; it being understood that the movable element can carry the flexible means and that the abovementioned branches then carry the rigid projections.
  • the elastic element (8a, 8b) is preferably formed by at least two parts fixed to the movable element and to the grip, respectively on either side of the axis of the guide element. It is constituted by an elastomer, a metal spring of the strand type or by a composite system provided that its elasticity is sufficient, so that the mobile element to which it is fixed can slide against the guide element from the retaining position by the flexible means (13a, 13b) up to the stop means (10), so that the centrifugal force can release the movable element by its movement towards the frame, and so that the aforementioned rigid projections can pass into the space between the flexible means (13a, 13b) and the wall (15) of the grip when the movable element is returned to the grip.
  • the device of the invention can be integrated into the racket. It can also be removable, the guide element being fixed on the one hand to the frame by the thumb screw (6a) and on the other hand to the grip through the orifice (4d) of the wall (15) of the grip and by the thumbscrew (5a) through the branches (2a, 2b) and the orifice (5b) of the guide element; the aforementioned fixing means can also be replaced by equivalent means.
  • the racket of the invention having the center of gravity automatically moved towards the grip after service or the smash, is a metallic racket or made of any other material but which comprises between the frame and the grip a free axial space in which is housed a guide element on which a heavy movable element can move, the grip being axially hollowed out in an appropriate manner to allow passage in particular to the elastic element (8a, 8b) and to the guide element.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Toys (AREA)
EP85402378A 1984-06-06 1985-12-03 Spielschläger mit automatisch veränderlicher Balance Withdrawn EP0228491A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR8408836A FR2565500B1 (fr) 1984-06-06 1984-06-06 Raquette a equilibre variable dont le centre de gravite est automatiquement ramene vers le grip apres le service ou le smash
EP85402378A EP0228491A1 (de) 1985-12-03 1985-12-03 Spielschläger mit automatisch veränderlicher Balance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85402378A EP0228491A1 (de) 1985-12-03 1985-12-03 Spielschläger mit automatisch veränderlicher Balance

Publications (1)

Publication Number Publication Date
EP0228491A1 true EP0228491A1 (de) 1987-07-15

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Application Number Title Priority Date Filing Date
EP85402378A Withdrawn EP0228491A1 (de) 1984-06-06 1985-12-03 Spielschläger mit automatisch veränderlicher Balance

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EP (1) EP0228491A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000021616A3 (de) * 1998-10-15 2000-07-20 Hermann Rieche Vorrichtung zur durchführung eines ballspieles
CN108970047A (zh) * 2018-10-29 2018-12-11 吉林师范大学 一种重心可调的网球拍

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2235714A1 (de) * 1973-07-05 1975-01-31 Hufenus Paul
FR2525113A1 (fr) * 1982-04-20 1983-10-21 Tores Denis Raquette pour jeu de balle, notamment raquette de tennis
BE897307A (fr) * 1983-07-18 1983-11-14 Papak Istvan Sommeryns Georges Raquette a centre de gravite variable par reglage manuel ou autoreglage
DE3218854A1 (de) * 1982-05-19 1983-11-24 Adolf 7148 Remseck Brunner Schlaeger fuer ballspiele
FR2565500A1 (fr) * 1984-06-06 1985-12-13 Hufenus Jean Raquette a equilibre variable dont le centre de gravite est automatiquement ramene vers le grip apres le service ou le smash

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2235714A1 (de) * 1973-07-05 1975-01-31 Hufenus Paul
FR2525113A1 (fr) * 1982-04-20 1983-10-21 Tores Denis Raquette pour jeu de balle, notamment raquette de tennis
DE3218854A1 (de) * 1982-05-19 1983-11-24 Adolf 7148 Remseck Brunner Schlaeger fuer ballspiele
BE897307A (fr) * 1983-07-18 1983-11-14 Papak Istvan Sommeryns Georges Raquette a centre de gravite variable par reglage manuel ou autoreglage
FR2565500A1 (fr) * 1984-06-06 1985-12-13 Hufenus Jean Raquette a equilibre variable dont le centre de gravite est automatiquement ramene vers le grip apres le service ou le smash

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000021616A3 (de) * 1998-10-15 2000-07-20 Hermann Rieche Vorrichtung zur durchführung eines ballspieles
CN108970047A (zh) * 2018-10-29 2018-12-11 吉林师范大学 一种重心可调的网球拍
CN108970047B (zh) * 2018-10-29 2020-02-21 吉林师范大学 一种重心可调的网球拍

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